A constrained optimization approach to multiuser detection

Interference cancellation or multiuser detection schemes are of great interest to the CDMA community because of their potential ability to treat the near-far problem and significantly reduce interference levels. A linear adaptive multiuser detection scheme based on constrained optimization is presented, constraints are constructed from knowledge of users' codes and associated timing. Both single- and multiple-constraint detectors are derived and shown to have interesting relationships to existing detectors. Simulation results, presented in the form of bit error rate curves, demonstrate the receiver's performance in an additive white Gaussian noise (AWGN) channel.